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A sprinkler system timer is an electrical device that is used to set an irrigation sprinkler system to come on automatically at a certain time. Irrigation timers first appeared in the early 1960s to control large-radius lawn sprinklers, which at the time usually contained their own electrically operated valve (most golf-course sprinklers still use this type of actuation).
The terms greenhouse, glasshouse, and hothouse are often used interchangeably to refer to buildings used for cultivating plants. The specific term used depends on the material and heating system used in the building. Nowadays, greenhouses are more commonly constructed with a variety of materials, such as wood and polyethylene plastic. [2]
In a hydroponic system ultrasonic hydroponic foggers [1] are used to create a fine mist, the individual particle size of which is typically of about 5 μm in diameter. These fine particles are capable of carrying nutrients from the standing water of a reservoir to plant roots. Benefits include humidification and exponentially improved root ...
Watchdog timers are commonly found in embedded systems and other computer-controlled equipment where humans cannot easily access the equipment or would be unable to react to faults in a timely manner. In such systems, the computer cannot depend on a human to invoke a reboot if it hangs; it must be self-reliant.
The idealized greenhouse model is based on the fact that certain gases in the Earth's atmosphere, including carbon dioxide and water vapour, are transparent to the high-frequency solar radiation, but are much more opaque to the lower frequency infrared radiation leaving Earth's surface.
"Mr. Farmer" is a song by American garage rock group The Seeds, written by vocalist Sky Saxon and produced by Marcus Tybalt. It was released as a single in 1967 and peaked at number 86 on the U.S. Billboard Hot 100 chart.
A runaway greenhouse effect similar to Venus appears to have virtually no chance of being caused by people. [5] A 2013 article concluded that runaway greenhouse "could in theory be triggered by increased greenhouse forcing", but that "anthropogenic emissions are probably insufficient". [6]
Our Mr. Sun is a 1956 one-hour American television film in Technicolor written, produced, and directed by Frank Capra.It is a documentary that explains how the Sun works and how it also plays a huge part in human life.